" War doesn't last forever. But change, once set in motion, is very difficult to undo. It's one of the first rules of magic: you can never truly reverse a spell. Dirt will remember being turned into gold, a conjured storm leaves marks on the landscape, a shadow will remember being bound - or free. And when this war passes, Commoner magic will be very difficult to bind again." She paused. "Besides. God works in mysterious ways."
"I won't argue, or course," Wilberforce said. "But it does seem difficult to see God in the last few years. "

― H.G. Parry , A Radical Act of Free Magic (The Shadow Histories, #2)